I think the NullPointerException was misleading for me... a more informational error message should be added. Rich, what do you think?
On Sat, Nov 29, 2008 at 3:41 PM, Ralf Bensmann <[EMAIL PROTECTED]>wrote: > Argl... just forgot one of the "basic rules" ;) > > > On Sat, Nov 29, 2008 at 3:33 PM, Randall R Schulz <[EMAIL PROTECTED]>wrote: > >> >> On Saturday 29 November 2008 06:27, Ralf Bensmann wrote: >> > Thanks for clarification. But I am wondering about a function can >> > return nil: >> > >> > user=> (fn [] ((+ 1 2) nil)) >> > #<user$eval__63$fn__65 [EMAIL PROTECTED]> >> > >> > But "just returning nil" is not ok? >> > user=> (fn [] (nil)) >> >> You're not returning nil, you're trying to apply nil (as if it were a >> function) to an empty argument list. >> >> >> > java.lang.NullPointerException (NO_SOURCE_FILE:24) >> > user=> (fn [] ((nil))) >> > java.lang.NullPointerException (NO_SOURCE_FILE:25) >> >> Now you're trying to apply the result of applying nil to an empty >> argument list to an empty argument list. Naturally, it fails at the >> same point, which is the inner attempt. >> >> >> It's just simpler than you're trying to make it: >> >> user=> ((fn [] nil)) >> nil >> >> >> >> > Thanks >> > -Ralf >> >> >> Randall Schulz >> >> >> >> > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
